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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '39dee92094ae4bd34f664582157080ec0f09da4492c1cc1b0245c1e0b08091f4' 
  AND token = 'aznJzEwDE2kWgzLFToMn2EVcWD9Cx8UhAumgCjTGkzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}